Cu+ doped Cs2AgBiBr6 double perovskite was synthesized by hydrothermal method and solar cells were fabricated based on this material.Optoelectronic properties were explored by ultraviolet-visible spectroscopy,fluo-rescence emission spectroscopy,X-ray photoelectron spectroscopy,incident photon-to-electron efficiency,photocur-rent-voltage curves.We found that Cu+ doping can significantly enhance the optical absorption of Cs2AgBiBr6 powder samples,but has almost no effect on Cs2AgBiBr6 films,which can be attributed to the decomposition of Cu phase perovskite during the process of dissolving in dimethyl sulfoxide.The experimental results show that when the Cu+ doping amount is low,the photoelectric conversion efficiency of solar cells is significantly improved.This is due to the regulatory effect of Cu+ doping on the crystallization process of Cs2AgBiBr6 thin films,and the defect density of perovskite thin films can be efficiently reduced by Cu+ doping.In the end,solar cells based on Cu+ doping achieved a maximum power conversion efficiency of 1.93%.
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